Automatic cut-off and reverse for steam-engines



E. P. WELCH.

AUTOMAHC CUT-OFF AND REVERSE FOR STEAM ENGINES.

APPLICATION FILED DEC. 24, 1918.

1 58,403. Patented Nov. 9, 1920.

5 SHEETSSHLET l.

E. P. WELCH.

AUTOMATIC CUT-OFF AND REVERSE FOR STEAM ENGINES.

APPLICATION FILED DEC.24, 19H]. 1,358,403, v Patented Nov. 9, 1920.

5 SHEETSSHEET Z.

With.

By 7 W QW E. P. WELCH.

AUTOMATIC CUT-OFF AND REVERSE FOR STEAM ENGINES.

APPLlCATlON FILED DEC.24 191B. 1 58,403. Patented Nov. 9, 1920.

5 SHEETSSHEET 3.

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awue/wtor,

[HFIYEST P. W51. CH

lli

v E. P. WELCH. AUTOMATIC CUT-OFF AND REVERSE FOR STEAM ENGINES.

APPLICATION FILED DEC.24,1918.

1 ,358,4 Q3, Patented Nov. 9, 1920.

5 SHEETSSHEETI 4.

Z/W/YEST 7? 1454c E. P. WELCH.

AUTOMATIC CUT-OFF AND REVERSE FOR STEAM ENGINES.

APPLICATION FILED DEC.24, 1918.

1,358,403. T Patented Nov. 9, 1920.

5 SHEETS-SHEET 5.

EARNEST P- WELCH, F GARY, INDIANA,

AUTOMATIC CUT-OFF AITD REVERSE FOR STEAM-ENGINES.

1.,aas,4.o3.

Specification of Letters Patent.

Patented Nov. 9, 1920.

7 Application filed December 24, 1918. Serial No. 268,179.

' To aZZ whom it may concern.

. in the accompanying drawings:

Be it known that 1, Fantasy P. WELCH, a citizen of the United States, residing at Gary, in the county of Lake and State of Indiana, have invented certain new and use ful Improvements in Automatic Cut-Offs and Reverses for Steam-Engines, of which the following is a specification.

This invention relates to steam engine valve gear and more particularlyto an improved automatic cut-off and reverse for steam traction engines.

One object of the present invention is to provide, in steam engine valve gear, an automatic means for controlling the motion of the automatic cutoff valve with relation to the main valve, and manually controlled steam actuated means for reversing the cocentrics which constitute a part of the means for controlling the motion of the main and automatic cut-oil? valves.

A. further object of the invention is to provide valve gear of the class described which willprove more eiiicient than manually controlled mechanically operated reverse mechanisms heretofore employed and by which economy in fuel and the consumption of water will be effected and the weight of the engine and valve gear considerably reduced.

Figure 1 is a view in side elevation of the valve gear embodying the present invention installed upon a traction engine;

2 is a plan view of the valve gear, the valve chest of the engine being shown in horizontal section; I V

3 and 3 represent a horizontal sectional view through the manually controlled steam operated means Zor reversing the eccentrics comprising a part oit'the means for controlling the movement of the main and automatic reverse valves;

Fig. i is a vertical sectional view on the line li of F 3 looking in the direction indicated by the arrows and showing the rotatable member of the servo-motor in its in termediate position;

Fig. his a similar view illustrating the rotatable member of the servo-motor in another or" its positions;

Fig. 6 is a plan view oi. a sleeve member which is fixed upon the crank shaft of the engine;

Fin.

4 is view in side elevation of the eccentric for controlling the motion of the automatic cut-oil" valve;

Fig. 8 is a plan view of the eccentric;

Fig. 9 is a horizontal sectional view throng-lithe rotatable member of the servomotor;

Fig. 10 is a vertical sectional view taken substantially on the line 10-10 of Fig. 11, looking in the direction indicated by the arrow;

Fig. 11 is a sectional view taken substantially on the line 11-11 of Fig. 10;

Fig. 12 is a perspective View of one of the members shown in Fig. 11.

In Figs. 1 and 2 of the drawings, the valve gear embodying the present invention is illustratedas applied to the engine of a steam tractor andinasmuch as the tractor itself constitutes no part of the present invention, it will not be specifically described. Of the engine of the tractor, however, the cylinder is indicated in general by the numeral 1, the piston working therein by the numeral 2, the valve chest by the numeral 3, the main valve by the numeral 4, and the automatic cut-oil? valve by the numeral 5, the said valves a and 5 being of the ordinary cylindrical construction and the latter shdmg within the former as usual. The mam valve t reciprocates in the usual cylindrical chamber 6 within the valve chest, and ports 7 lead from this chamber to the opposite ends of the cylinder 1 for conducting the live steam to the ends of the said cylinder. The numeral 8 indicates the crank shaft which is driven from the engine through reciprocation oi the piston 2, and fixed upon one end of this shaft is the usual crank disk 9 to the wrist pin of which is connected the usual connecting rod 10 which extends to the rod of the piston 2. As ordinarily, the shaft 8 carries a combined fly wheel and pulley ll from which power may be taken in driving threshers and other farm machinery, and any suitable and conventional train of gearing 12 transmits power from the shaft 8 to the traction wheels of the tractor. The numeral 13 indicates a tubular valve stem which is secured to one end of the main valve 4; and works through a stuiiing box 14 upon one end of the steam chest 3, and working in this tubular valve stem is the stem 15 for the automatic cut-ofii' valve 5, thislatter stem being preferably extended to work through. a stuffing box 16 at thatend of, the steam chestopposite the end at which the box 14 is located. The operative connection between the mechanism embodying the present invention and the valve stems and 15 will presently be specifically described. I Y 1 Briefly described, the mechanism of the .present invention includes a servo-motor device which is arranged uponthe shaft 8 of the englne and through the operation of avhich eccentrics for imparting motion to the main and automat c cutoff valves may be reversed-so as to reverse the engine, manually f'op eriable valve means being provided for controlling the supply of steam to the servomotor'for the purpose of adj usting theeccentrics. The servo-motor and eccentrics above referred to are not mounted directly' upon the shaft 8 but .upon a sleeve which'i's fitted to and rotatable with the shaft. This sleeve is indicated in general byjthe' numeral 17 and the same is connected for rotation with the shaft by a -ke'y'or other suitable device indicated by the numeral 18. Throughout the major portion of-Tits length. or more specifically throughout that'portion of its length upon [which the s iiqemotor. is mounted, the

sleeve is of uniform diameter. but throughout the remainder of its length is reduced in .diameter-as'indicated by thenumeral 19, this latter portion of the sleeve supporting the eccentrics. The servo motor is indiever, coveredby a copper plate or head 24 bolted orlotherwise secured in place as in dicated by the'numer'al 25 so as to close the seg en s; 23. A packing ring 26 is seated in a circumscribing groove 27 formed in the sleeve 17. and in .a companion groove 28 formed in the inner face ofthe plate 24 and surrounding the opening in the plate which is providedto accommodate the sleeve 17. This packing ring serves,of course, to prevent leakage of steam from the stea chamber 23 oftherotor. The steam cham ber 23 of the rotor substantially of segmental form, the outer arcuate wall thereof being indicated by the numeral 29, and the end walls one by thenumeral 30 and the other by the numeral 31. For a purpose to be presently eirplained, the end walls 30 and-'31 areprovided with shoulder portions indicated by the numerals 32 and 33 re spectively 'Als o for apurpose to be presently explained, the wall of the opening 22 is the ro s-s terme w th a eir u r tially extending passage 3st which passage extends between the inner ends of the end walls 30 and 31 of the steam chamber 33 and communicates with the said chamber. The closed side of the rotor constitutes one side wall of this passage, and as the passage does not open through that face of the rotor through which the steam chamber 23 opens, the said passage is closed except at its ends. A packing" element 35 is mounted in the rotor 21 and extends into the passage 31-- so as to position a steam-tight partition wall within the passage. As illustrated in Figs. 41 and 5, the packing 35 is pressed into steam tight engagement with the sleeve 17 by means of a longitudinally curved leaf spring The piston of the servo-motor is in the nature of a relatively thick blade or head 36 which is integral with or socnred to the outer surface of the sleeve 1'? and projects radially therefrom and into the steam chamber 23 of the rotor, this piston blade or head being of a width and radial length substantially corresponding to the width and breadth of the said chamber 23. In order, however, to insure of a steamtight fit between the piston head .36 and the walls of the chamber 23, the side and outer edges of the head 36 are formed with grooves 37 whlch receive packing strips 38 normally held projected by leaf springs 39 operating against the inner edges of the packing strips and against the inner walls of the grooves. The piston head 36, of course, rotates with the shaft 3 inasmuch as it is carried by the sleeve 17 which is fixed upon the shaft, but it will be understood that when live steam is admitted to the chamber 23 at one side or the other of the piston head 36, the rotor 20 will be rotated upon the sleeve 17 in the direction from which steam' is admitted. Thus ii" the piston head 36 is in the position shown in Fig. 5 of the drawings as also the rotor 20, in which position the shoulder 33 will abut against one side of the piston head 36 and steam is admitted into the space between the said face or side of the piston head and the end wall 31 of the steam chamher, the rotor will be rotated to the right in the said figure and upon the sleeve 17 notwithstanding the fact that it also rotates with the sleeve. ()n the other hand, should the shoulder 32 be in engagement with the opposite face of the piston head and should steam be admitted into the space between the said face of the piston head and the end wall 30 of the steam chamber, the rotor would be rotated toward. the left or in the reverse direction to thatmentioned above and until the shoulder 33 had come into position against the said piston head. 'In order that steam may be admitted to either side of the piston 36, the sleeve 1? is formed with longitudinally extending steam passages 40 and 41 and with ports 42 and 43 which establish communication between the ports 40 and 41 respectively, and the steam chest at opposite sldes of the piston 36, the port 42 opening into that end of the steam chest having the end wall 31 and the port 43 opening into that end of the steam chest or chamber having the wall 30. In addition to the ports 42 and 43, the sleeve 17 is formed through its exterior with other ports 44 and 45 which communicate respectively with the passages 40 and 41.

Associated. with the rotor of the servomotor is a steam chest through which steam is supplied to the steam chamber 23 of the rotor and this chest is indicated in general by the numeral 46 and is in-the nature of a two section substantially cylindrical body which is disposed to fit about the sleeve 17 as clearly shown in Figs. 3 and 11 of thedrawings, and which is provided interiorly with circumferential steam passages 47 and 48 which are in communication respectively with the ports 44 and 45., The chest 46 is further formed interiorly with circumferential grooves 49, 50 and 51 receiving packing rings indicated respectively by the numorals 52, 53 and 54 these rings seating in companion grooves 55, 56 and 57 formed exteriorly in the sleeve 17. The packing rings serve to prevent escape of steam from one to the other of the passages 47 and 48 and the escape of steam from either passage to the exterior of the chest. One end of the chest 46 abuts against the closure plate or head 24 for the rotor and the chest is held in its position through the medium of the packing rings. The numerals 58 and 59 indicate steam conducting pipes which are fitted at their ends into one side of the chest 46 and communicate, respectively, with the steam passages 47 and 48.

Before proceeding to a description of the eccentrics for controlling the motion of the main and automatic cut'ofi' valves, and the manner in which these eccentrics are shifted, 1 will first describe the manually operable valve for controlling the supply of steam to the steam chest or: the servo-motor. This valve is clearly illustrated in Fig. 3 of the drawings and is indicated in general by the numeral 60, being mounted upon the tractor at a point near the operators position, as clearly shown in Fig. l of the drawings. The casing for the valve is indicated by the numeral 61 and live steam is to be supplied to the casing by a steam pipe 62 which leads from the steam dome of the boiler and which pipe may be provided with any suitable manually operable cut-oil valve 63. The pipe (ommunicates with the upper side of the valve casing 61 intermediate the ends thereoi, and exhaust ports 64 and 65 lead from the valve casing at the under side thereof and at the ends of the said casing. The valve cas ing 61 is interiorly cylindrical and the same is formed with steam passages 66 and 67 which communicate with the pipes 58 and 59 respectively, these pipes being fitted at their ends opposite their ends which communicate with the steam chest 46, through stuffing boxes 68 and 69 respectively, which boxes are located at one end of the valve casing 61. The said ends of the pipes 58 and 59 are fitted through the stufiing boxes in a steam tight manner but yet may have movement through the boxes to accommodate for expansion and contraction and for stress imposed through the operation of the tractor. In order to relatively brace the chest 46 of the servomotor and the casing 61 of the valve 60, a rod 70 is secured at one end in the side of the chest 46 and at its other end in the above mentioned end of the valve casing 61. This rod 70 and the pipes 58 and 59 serve also as a means for holding the steam chest 46 against rotation with or upon the sleeve 17. A cylindrical bushing or liner 71 is fitted into the valve casing 61 and abuts at one end against that end of the casing through which the pipes 58 and 59 enter and which end of the casing is closed except for the communication or the pipes with the passages 66 and 67.

The other end of the bushing or liner is en gaged by a head 72 which is secured to and closes the other end of the valve casing 61. In its ends, the bushing is formed with exhaust passages 73 and 74 which communicate with exhaust steam passages indicated re spectively by the numerals '75 and 7 6. The said bushing is also formed between its ends with ports 77 and 78 which respectively establish communication between the passages 66 and 67 and the interior of the bushing.

The valve proper is of the piston type and comprises the usual body 79 provided at its ends with heads 80 and 81 which are provided with suitable packing rings 82 and 83 fitting within the bushing 71 in a steam-tight manner, the body 79 throughout its intermediate portion being reduced in diameter so as to provide a steam passage 84 about the valve. The stem of the valve is indicated by the numeral 85 and the same is slidably fitted through a stuffing box 86 upon the head. 72 and is pivotally connected as at 87 with a hand lever 88 located in front of the operators position upon the tractor where it may be conveniently adjusted in the operation of the mechanism. In order that steam supplied to the valve casing may pass to the space 64 and consequently to the ports 7 7 and 7 8, the casing 61 is provided interiorly with a steam passage89, and the bushing 71 is formed with ports 90 establishing communication between the said passage 89 and the said space 84.

Upon swinging the lever 88 to the left in Fig. 3 or, in other words, in a rearward direction, the valve 79 will be moved to such positionth'at the head 80 will lie between the ports 77 and 90 and live steam will then be supplied from the passage 89, through the 450, port 44-, pipe 58, passage 66, ports 77,

and exhaust ports 64L. On the other hand,

when the lever 88 is swung forwardly or, in other words, toward the right in Fig. 3 of the drawings, the valve T9 will be shifted so that-its head 81 will lie between the ports 78 and the ports 90 and in such position of the parts, live steam will pass from the passage 89' through the ports 90, into the annular passage 84, through the ports 77, passage 66, pipe 58, port 4C4, passage 40, and

port 12 to the forward or right hand side of the piston in Fig. 3 of the drawings where, acting against the piston and the end wall 31 of the steam chamber of the rotor, it will cause rotation of the rotor in a clockwise direction or, in other words, toward the right in Fig. 5 until the shoulder portion 32 comes into engagement with the rear face of the piston 36. At such time, steam will exhaust from the said steam chamber of the rotor at the other side of the piston, through the port 43, passage 4L1, port 45, pipe 59, passage 67, ports 78, and exhaust port to the atmosphere. From the foregoing it will be seen that by a simple shifting of the lever 88, the rotor of the servo-motor may be rotated in a forward or rearward direction about the sleeve 17 while at the same time it is rotating with the said sleeve. By the provision of the passage 34 in the rotor of the servo-motor and the provision of the packing element 35, the steam pressure within the steam chamber is balanced at the opposite sides of the piston and more particularly, the pressure of steam against the wall 29 and the opposing surface of the sleeve 17 will not bind the wall of the opening 22 against the sleeve in a manner to interfere withfree rotary adjustment of the rotor about the sleeve. 7

The eccentric for imparting motion to the main valve 4 is indicated in general by the numeral 91 and has an eccentrically positioned opening 92axially alined with the opening 22 of the rotor of the servo-motor and of a diameter to snugly and yet rotatably fit the reduced portion 19 of the sleeve 17, the said eccentric being integral with that face of the'rotor 20 opposite the face to which the closure plate 24; is applied. A packingring 93 is fitted in a groove formed in the said reduced portion of the sleeve 17 and serves to prevent escape of steam. For a purpose to be presently explained, the outer face of the eccentric 91 is formed with an arcuate slot 94 concentric to the axis of the shaft 8 and to the opening 92. Fitted to the eccentric 91 is an eccentric strap indicated by the numeral 95, and a radius rod extends from the strap 95 and is pivotally connected at its forward end to the outer end of the tubular valve stem 13 for the main yalve i. The main valve eccentric 91, of course, rotates with the rotor of the servom'otor which in turn is driven through the rotation of the shaft 8 so that recipro'catory motion is imparted to the main valve 4-. However, when the rotor of the servo-motor is rotatably adjusted upon the sleeve through manipulation of the controlling lever 88', the said eccentric will be correspondingly rotatably adjusted so as to reverse the motion of the main valve.

The automatic cut-oil valve eccentric is indicated in general by the numeral 98 and is provided with an eccentrically located opening 99 to receive the reduced portion of the sleeve 19, this eccentric being rotatable upon the said sleeve and being positioned beside the outer face of the eccentric 91. For a purpose to be presently explained, that face of the eccentric 98 which is presented toward the outer face of the eccentric 91 is formed with a laterally projecting stud 100 which works in the slot 94:. The opposite or outer face of the eccentric 03 is formed with an arcuate slot 101. To establish driving connection between the shaft 8 and the eccentric 98, there is provided a driving member which is clearly shown in Fig. 12 of the drawings and indicated in general by the numeral 102, this member comprising a ring 103 disposed to lit the shaft 8 at the reduced end of the sleeve 17 and provided upon its face which opposes the end of the sleeve with segmental lugs or bosses 104 which are fitted into correspondingly formed recesses 105 formed in the end of the sleeve 17 securing screws or bolts 106 being fitted through the ring 103 between the ends of the bosses 104C and into the said end of the said sleeve. The ring is provided with a peripheral car 107 and this ear supports a laterally projecting stud 108 which works in the slot 101. T he slot 91- extends through approximately 72 and the slot 101 extends through approximately 38. the relation of these slots in one position of the eccentrics being shown clearly in Fig. 10 of the drawings and this figure illustrating also in broken lines another extreme position of adjustment of the eccentrics. Assuming that therotor of the servo-motor and the piston of this motor occupy the relative positions shown in Fig. 5 of the drawings in which position the piston 36 is in driving engagement with the shoulder portion 33 of the wall 31 of the steam chamber 23 of the rotor, and further assuming that the stud 100 is inengagement with one end of the slot 94 and the stud 108 is in engagement in one end of the slot 101, motion will, of course, be transmitted from the shaft to the rotor through the piston 36 as well as from the shaft, through the stud 108 to the automatic cut-ofl valve eccentric 98 and through the pin'100 upon this eccentric to the main valve eccentric 91 and consequently to the rotor 20. Thus the rotor of the servo-motor rotates with the sleeve 17 as also the eccentrics 91 and 98imparting reciprocatory motion to the main and automatic cut-off valves. In order to reverse the motion of these valves, the lever 88 is to be adjusted so as to admit steam into the space between the piston 36- and the wall 31 of the steam chamber 23 of the rotor 20 whereupon the said rotor 20 will be rotatably adjusted about the sleeve 17 carrying with it the main valve eccentric 91. In this rotation of the main valve eccentric with relation to the sleeve 17 and, consequently, to the shaft 8, the main valve will have its motion reversed. The rotor 20 in its rotative movement about the sleeve 17 moves through substantially 110 and, consequently, the opposite end wall of the slot9 1 will first be brought into engagement with the stud 100 when the eccentric 91 has moved through substantially 72 and upon further motion the stud 100 will be carried with the main eccentric 91, thus picking up and rotating the automatic cutoff eccentric 98 through substantially 38 which will bring the opposite end of the slot 101 into engagement with the stud 108 upon the driving member 102. Of course, the rotative adjustment of the eccentric 98 will reverse the motion of the automatic cut-off valve. 1 s

An eccentric strap 109 is fitted to the eccentric 98 and a short rod 110 extends from this strap and is pivotally connected as at 111 with a link'112 which is pivotally mounted at its lower end as at 113 and which corresponds to the link of the ordinary valve gear. The usual link block 11 1 works in the link 112 and connected to this block is a radius rod=115 which rod extends to and is pivotally connected as at 116 wlth the stem 15 of the automatic cut-off valve 5. The motion of the automatic cut-off valve eccentric 98, of course, imparts oscillatory motion to the link 112 and when the link block 114 is in the upper portion of the link, the automatic cut-off valve will have full travel, but the length of stroke of this valve will be shortened as the block 11 1 moves downwardly in the link. In order to auto matically adjust the block in the link 1n 'wheel 131..

accordance with variations in load, a governor device is provided which may be of any conventional type so long as it is adapted to act upon the radius rod 115 to automatically raise and lower this red in accordance with variations in the speed of rotation of the governor. The governor illus trated in the drawings is of centrifugal ball type and is indicated in general by the numeral 117, the stem of the governor being indicated by the numeral 118, the balls by the numeral 119, and the sleeve which is slidable upon the stem by the numeral 120. A. bracket 121 extends from a fixed part of the governor and mounted for rocking movement upon this bracket is a lever 122 provided at one end with a ball weight 123 and having piyotally connected to its other end as at 124, the upper end of a link 125 which link at its lower end is pivotally connected as at 126 with the radius rod 115. Of course, as the sleeve 120 is moved upwardly through the outward movement of the balls 119 when the governor is running at hi h soeed the lever 122 willbe rocker so as to move the link 125 downwardly and thereby move the link block 11 1 downwardly 111 the link so as to shorten the stroke of the automatic cut-off valve. On the other will be moved upwardly in the link 112 thus increaslng the length of stroke of the automatic cutoff valve. Motion is imparted to the governor by means of a bevel gear 127 fired upon the shaft 8 and meshing with a beveled gear 128 fixed upon a shaft 129 which is j'ournaled in the frame of the governor and carries a friction wheel 130 with which cooperates a friction wheel 131 mounted upon a shaft 132 within the frame of the governor and suitably geared with the governor stem. The friction wheel 131 is slidably but non-rotatably mounted uponthe shaft 132 so that rotary motion is tran mitted from the shaft 129 to the cross shaft 132 through contactof the disk 130 and the The wheel 131 is movable across the face of the wheel 130 so that the governor may be set for any desired speed.

As illustrated inl igs. 1 and 2, the ratio between the disk 130 and the wheel 131 may be varied through themedium of a manually operable shaft 133 having its forward end provided with a worm 134 meshing with the gear 1341 of a sleeve 135. The sleeve 135 is threaded through a collar 136 carried by the governor frame and connected to the wheel 132 so that the wheel may be moved across the face of the disk 130 by rotation of the shaft 133. The rear end portion of the shaft 133 is rotatably supported by a bracket 137 secured to one side of the valve caseGO and is provided with an operating wheel 138 arranged adjacent the various other operating devices for the tractor.

hen it is desired to set the governor to 'act at a high speed of the tractor, the wheel 131 may be moved inwardly toward the center ofthe disk 130 so as to decrease the -hand,"i-f it is'desired to set the governor to act during a slow speedofthe tractor, the wheel is moved outwardly toward the pe riph'eryof: the disk li O'whereby the speed ofthe-governori'shaft 132 is increased as compared with the speed ofthe crank shaft 8. "In this manner the number of revolutionslper' minutemade by the governor is appreciably increased as compared with the number of revolutions made-by the crank shaft 8 and therefore the governor will act at "a much'slower speed;

In this manner the o erator of the tractor may manually set the governor to act at any speed withoutthe necessity of leaving ,his' s'ea't'for the other operati gd i bf the tractor. It is obvious also that the governor is capable of various intemnediate adjustments c Having thus. described the invention, what is claimed as new is: V

1. In reversing. mechanism of thefclass described,fa steam engine shaft, mainand cu't off-valve eccentrics mounted thereon and rotatably 'shiftable a 'servo motor including a rotorf carried by the shaft and rotatably shi ftable thereon,'means for efiecting adjustmerft ofv the eccentrics upon the rotative adjustment of the rotor, and-means for, con trolling'the servo-motor. 7

In -reversing mechanism ofjthe class described, a steam engine shaft, mainand cut oif-valve eccentrics mounted thereon and rotatably shiftable, a l's ervo-motor including a rotor"carried by'the shaft and rotatably shi ftablethereon, one of said eccentrics being movable with the rotor, means forfleffect ing adjustment of the other eccentric upon rotative adjustment of the rotor, and means for controlling the servo-motor.

3'. I n reversing'mechanism of the class described, a steam engine shaft, mainand cutoff-valve eccentrics mounted thereon and rot'atably shiftable, and a servo-motor including a rotorcarried by the shaft and r6 tatnbly shiftable thereon, the main valve eccentric being rotatable with the rotor, means for effecting adjustment of the cutoff-valve eccentric upon rotative adjustment of the main valve eccentric, and means for controlling the servo-motor.

1. In reversing mechanism of the class de scribed, a steam engine shaft, mainand cut oif-jvalve eccentrics mounted thereon and rotatably shiftable, a servo-motor including a rotoli carried by the shaft and rotatably shiftable thereon'and having a steam chaniher, a piston fixed with relation to the shaft and extending into the saidsteam chamber, means for selectively supplying steam to the steam chamber at either side of the piston, and meansfor effecting adjustment of the eccentrics upon rotative adjustment of the rotor.

In reversing, mechanism of the class described, a steam engine shaft, mainand cutoff-valve eccentrics mounted thereon and rotatably adjustable, a'servo-motor including a rotor carried by the shaft and rotatably'shifjtable thereon and having a steam chamber, a piston fixed with relation to the shaft and extending into the said steam chamber, means for sele t y upp yi g steam to the steam chamber at either side of the piston, one of the eccentrics being rotatfiblewith the rotor, and means for effecting adjustment of the other eccentric upon rotatiyeadjustment of the rotor.

6'. In reversingmechanism of the class described, a steam engine shaft, mainand cutoff-valve eccentrics mounted thereon and rotatably shiftable, a servo-motor including a rotor rotatable with the shaft and rotatably shiftable with respect thereto, means for effecti ig adjustment ofthe eccentrics upon lotative adjustment of the rotor, and means for controlling the, servo-motor.

In reversing. mechanism of e as described, a steam engine'shaft, mainand cut ofi' valve eccentrics mounted thereon and rotatably shiftable, a servo-motor includinga rotor, rotatable with the shaft and rotatably shiftable with relation thereto,the rotor having aste'am chambeiya piston fixed with relation to the shaft and extending into the steam, chamber of the rotor, means for effecting adjustment of the eccentrics upon rotative adjustment of the rotor, a steam chest upon, the shaft having communication with the steam chamber of the rotor atopposite sides of the piston, and means for controlling the supply of steam to and exhaust of steam from the said steam chest.

'8. In revers'ingmechanism'of the class described, a steam engine shaft, mainand cut-olfvalve eccentrics mounted: thereon and rotatably shiftable, a servo-motor including a rotor rotatable with the shaft and rotatably shiftable with relation thereto, one

of the eccentrics being rotatable with the 1:0-

tor, coacting means upon the saideccentric and the other eccentric for rotatably adj ustably shifting the latter upon adjustment of the former, and means for controlling the servomotor.

9. In reversing mechanism of the class described, a steam engine shaft, mainand cutoff-valve eccentrics mounted thereon and rotatably shiftable, a servo-motor including a rotor rotatable with the shaft and rotatably shiftable with relation thereto, the rotor having a steam chamber, a piston fixed with relation to the shaft and extending into the steam chamber, means for selectively admitting fluid under pressure to the steam chamber at opposite sides of the piston therein, the said chamber having a circumferential length less than the entire circumference of the rotor, the rotor having a steam passage in communication with said steam chamber,

a packing extending into the steam passage,

and means for efiecting adjustment of the eccentrics upon rot-ative adjustment of the rotor.

10. In reversing mechanism of the class described, a steam engine shaft, a sleeve mounted thereon and rotatable therewith, mainand cutoff-valve eccentrics mounted upon the sleeve and rotatably shiftable, a servo-motor including a rotor mounted upon the sleeve and rotatable therewith and rotatably shiftable thereon, means for effecting adjustment of the eccentrics upon rotative adjustment of the rotor, a steam chest upon the sleeve having steam passages, the rotor having a steam chamber, a piston extending from the sleeve and into the said steam chamher of the rotor, the sleeve having steam passages establishing communication between the steam chest and the steam chamher of the rotor at opposite sides of the piston, steam conducting pipes communicating with the steam chest, and a manually adjustable valve for controlling the supply of steam to and the exhaust of steam from the said pipes.

11. The combination with a steam engine shaft, of main and cutoff valve eccentrics mounted thereon, a rotor rigidly connected to said main valve eccentric and having a segmental chamber, a piston connected to said shaft and arranged in said segmental chamber, and means for admitting fluid pressure to said segmental chamber on either side of said piston for rotatably adjusting said rotor and said main and cut-off valve eccentrics, said cut-off valve eccentric being connected to said main valve eccentric and adjustable with relation to the same.

12. The combination with a steam engine shaft, of a sleeve secured thereon and having longitudinally extending passages provided with ports, main and cut-off valve eccentries mounted on said sleeve, a rotor rotatably arranged on said sleeve and having a segmental chamber in communication with said ports, said rotor being rigidly connected to said main valve eccentric, a piston connected to said sleeve and arranged in said chamber between said ports, a valve chest surrounding said sleeve and having means for supplying steam through said passages to said chamber on either side of said piston whereby either end wall of said chamber may be engaged with said piston for shifting said main and cut-0E valve eccentrics.

In testimony whereof I alfin my signature.

EARNEST P. VVELCH, [1 s] 

